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p ppmlhdfe PPML/Poisson Regression with High-Dimensional Fixed Effects (Multi-Way Fixed Effects)

* Author: Sergio Correia. Board of Governors of the Federal Reserve System
* Support: sergio.correia@gmail.com
*
* Author: Paulo Guimarães. Banco de Portugal
* Support: pfguimaraes@bportugal.pt
*
* Author: Thomas Zylkin. University of Richmond
* Support: tzylkin@richmond.edu
